Lens-edge-grinding machine



Feb. 1 y H. T. DANIELS LENS EDGE GRINDING MACHINE Filed Feb. lO, 1923 @Het um# Feb. 1 1927.

l11,616,178 H. T. DANIELS LENS EDGE GRINDINGMACHINE Filed Feb. 10, 1925 5 sheets-sheet 2 pmi 'www nimm i lll 2,

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H. T. DANIELS LENS EDGE GRINDING MACHINE Filed Feb. lO, 1923 3 Sheets-Sheet 5 ,summe Patented Feb. l, 1927.

HAR-RY T. DANIELS, F PROVIDENCE, RHQBE ISLAND.

LENS-EDGE-GRINDING MACHNE.

Application :filed February 10, 1923.

This invention relates to an improved attachment 'for lens edge grinding machines, and has tor its object to provide a trame or holder in which a lens is rotatably supported with its edge in proximity to a grinding wheel and toalso provide means whereby the holder carrying the lens may be shifted to present the edge port-ion ot the lens at dill'erent anglesK to the wheel without removing the lens trom its mounted posit-ion therein. A further object of the invention is to provide means whereby the shitting of the lens-carrying means from one position to another cannot be effected wit-hout first lifting the support to move the lens clear of the grinding wheel.

The invention further consists in the provision olf means whereby the lens with its supporting trame may be adjusted laterally with respect to the plane of rotation of the grinding wheel to compensate for the different angular positions o'l` the lens relative to the wheel when its holder is set at its different working position.

A still further object ot this invention is to so construct the mechanism that it may be readily attached to a standard type of grinding machine and use the regular patterns and lens holding tace plate of that ma "\0 chine.

A still further object ot the invention .is to so mount the frame in the machine that the trame with the work may be lifted or swung back from operative position into a position to permit the ready removal of the finished lens and the positioning ot a fresh lens in the holder.

lvVith these and other objects in view, the invention consists of certain novel features of construction, as will be more fully described, and particularly pointed out in the appended claims.

lin the accompanyingv drawing:

Figure 1 is a side elevation partly in section illustrating myl improved mechanism ilso showing a portionota grinding wheel in position to enga-ge and grind the edge of a lens, the work-carrying head member being set on an angle to bevel the edge of the lens.

Figure 2 is a top view of the mechanism illustrated in Figure l, showing portions broken away and partly in section to better illustrate the action of the machine, the worlscarrying head member being set in an upright position.y

Figure Il is a detail showing an end view Serial No. 618,322'.

ot the pivot pin or shaft and its adjustable bearing mounted in each arm of the tori; member.

Figure 4: is a detail in perspective showing the V-shapcd centering tool tor determining the accurate setting oit the lens through a backward or forward movement of its supporting cradle to bring its central plane in line with the axis oi' the pivoting pins in the forked trame.

Figure 5 is a central sectional view through the head and cradle members showing the arrangement of the guiding pattern and the lens-supporting and driving mechanisms.

Figure 6 is a top View ot a portion ot the cradle partly in section with the head member mounted thereon and the pivoted lens clamp arm mounted on the head member which carries the lens clamping tace plate.

Figure Tis a modified construction showing a section at line 7-7 of Figure l with a cam mounted at the pivoting portion, for adjusting the lens-carrying mechanism laterally relatively to the plane ot rotation ot the grinding wheel.

Figure 8 is a side elevation ot this moditied construction illustrated in Figure 7.

Figure 9 is an edge view oi a hand clamp with a lens mounted on the tace plete. thiclamp being employed for clamping the len in position on the tace plate to permit its accurate setting before being mounted in the machine.

Figure l0 is a face view ol" the device shown in Figure 9.

Figure l1V shows a face view and sectional edge elevation of the face plate, respectively, to which the lens may be first clamped by the hand clamp.

Figure l2 is a tace view of the lens tern.

Figure 13 is a face view of one shape of. lens showing the arrangement of dots placed upon its face to facilitate the proper setting ot' the lens on its tace plate before mounting both in the machine.

Fig: lll is a detailed view of the means for locking the arm in its clamping position.

By my improved device the lens may be mounted in a holder pivotally mounted in a machineto be positioned to grind the edge ot a lens at right angles to the face surface ot the lens and swung to the desired angles on opposite sides of the center to grind the edges ot the lens in V-shape and all et 'whieh grinding: positions may be obfY pattill

tained without removing the lens from its holder; and the Jiollowing is a detailed description ot one construction ot mechanism by which these advantageous results may be obtained Vith reference to the drawings, l designates a portion ot the main or standard machine on which my in'iproved attachment is mounted, 'the same comprising essentially a braclrct 1G having a base with suitable guides 'i7 in which the standard member i8 of my improved device is mounted and which standard may be slid on the bracket and adjusted laterally to accurately position the edge ot the lens relatively to the working sui-tace otl the grinding wheel to compensate tor the throwl of the edge ot' the lens on the grinding wheel when its holder is moved to ditli'erent angular positions.

ln this standard, l have pivotally mounted a guide trame 19 by a pin 20, the latter passing` through side cars 21 on the standard and also side ears on the guide trame 19, as best illustrated in Figure 'llhis pin is threaded at one end 23 and provided with a handle 24 at its opposite end by which the two pivoting ears may be clamped to bind the guide trame in any adjusted position. The guide trame is also provided with a stop lug Q5 adapted to engage a boss Q6 on the standard, to limit the upward throw ot the lens-supporting mechanism hereinafter described.

ln the front tace ot this guide frame is Yformed a dovetailed slot 25 in which is slidably mounted a correspondingly shaped member 2T `formed on the torlred frame 28 whereby this torled frame is adapted to be adjusted vertically in this 'trame through an operating handle 29, or by a micrometer screw adjustment presently described, and secured in any adjusted position by means ot a binding screw 30.

Mounted between the arms 3l ot the 'forked frame, is a cradle member which is also provided with side arms B3, each arm being provided with a pivot pin 34 passing through the adjacent arm ot the forked trame. The arms ot this cradle 82 are adjustably mounted to Vbe moved laterally, each on a bearing block 35 mounted on its pivot pin .3f-l, the adjustmentbeing obtained by a screw 36 threaded into its block, which screws are adapted to draw the cradle outwardly against the tension oi the coiled spring 87 and permit it to move baclrwardly by action ot said springs, by which construction it will be seen that the cradle is pivotally mounted upon the pins 34 whereby it is adapted to swing on these pivots to present the opposite edges et che lens at the desired angles to the working tace ot the grinding wheel 38 which wheel or stone is mounted on a shaft 39 and driven through a pulley l0 and is usually given a traverse motion by means, not shown.

in this cradle 82 is mounted a vertically reciprocating head member stl on the dovetaled slide 412 and this head comprises a trame in the upper portion ot which is mounted a cross shaft i3 having mounted on its outer end a pattern le which is ot a size and shape to determine the size and shape to which the edge ot the lens or worl: shall be ground. rlhe edge of this pattern is arranged to engage the control or guide roll mounted at the lower end ot arm i6 which is hingedly connected through a pivot eti" at its upper end, to the cradle 32, and this arm is bound in operating position by means ot a screw #i8 whereby when it is desired to remove the pattern and replace it by one oi another size and shape, it is only necessary to remove screw i8 to swing arm i6 outwardly whereby the replacing operation is readily etiected.

The lens i9 to be ground is mounted between the inner and outer face plates and 5l in this head, the outer tace being adjusted to clamp the lens against the inner tace plate by means ot the adjustable screw 52 which is provided with a collar 53 engaging a bearing member 54: which is slidably mounted in the cross arm 55. This cross arm 55 i pivoted at one end at 5G with its tree end arranged to be locked in closed position by means ot' a lrey 57, whereby when the elongated head ot' the key is rotated OOO it is adapted to register with a corresponding slot` 58 in the end ot the arm thus releasing the arm to be swung back with its lens clamps to permit the lens to be removed utter having been llinished.

in order to drive the lens clamps and the in time with its pattern te, I have cau-cd the pattern and the lens to be driven in unison through pinion 59, large gear 6() and pinion 6l by a motor 62 through a tier:- ible shatt 4635, worm 6st and worm gear G5, which latter is mounted on the short shalt 43, and in order to yieldably press the work against the grinding tace oit the wheel and cause it to be cut tothecxact contour ot thc pattern, I have mounted a coiled spring' G6 in an openingl 6T in the cradle, the lower end ot which spring is arranged to press against a pin 68 mounted in the head member which vorhs in a slot 69 in the cradle whereby the pressure ot the spring` uponI this pin acts through the frame ot the head to press the edge ot the pattern againstthe limit roll d5 and the edge ot the lens against the grinding wheel while it with its pattern are being rotated.

It will be noted trom the above that the head member carrying the work or lens, is mounted in the cradle memberto move vertically to cause the head with its work to follow the contour of the pattern. 'The cradle member is pivotally mounted on pivot pms 3L): in the forked frame and is adapted to be laterally adjusted on its pivots whereby the central plane through the edge vof the lens may be positioned on the axial line through the pivots; also by this construction the cradle with its work carrying head member may be set either vertically as illustrated in Figure 2, or at an angle on either side of the center (one of which is illustrated in Figure l), for the purpose of grinding the desired V-shaped bevel on the edge of the lens.

Ordinarily in beveled work it is only required that the cradle member shall be in three positions, a vertical position and a predetermined angle on either side of the vertical and in order to lock the cradle in either of these desired positions, I have provided a disk member with three notches 7l any one of which is adapted to be engaged by the free end of the latch bolt 72 to lock the cradle in any of its corresponding positions'. This bolt is pressed into engaging position by the coiled spring 78 and it may be positively locked in engaging position by a lixed pin 7 4: supported on a bracket 77 and extending through a hole 75 in the enlarged end of the bolt.

In order to withdraw this bolt from locked position it is therefore necessary to raise the forked frame 8l in its guide frame 17 and so withdraw the pin from the bolt permitting the bolt to be then withdrawn against its spring pressure by means of the operating handle 76.

In order to determine the exact dimensions to which the minor axis of t-he lens shall be ground, I have provided a micrometer adjusting screw 8() which is carried in the forked frame 28, the lower end of the screw 78 providing a stop against the hardened bearing face plate 79 and which screw is adjusted to determine the limit of the downward movement of the lens. Means for compensating for the wear of the working face of the grinding wheelis provided for in the micrometer by adjustment of the central spindle 8l relatively to the sleeve 82 which adjustment is accomplished by first rotating back the head member 83 until the hole 84 registers with the binding screw 85 which is loosened permitting the central spindle 81 to be moved to adjust the micrometer reading to the desired point after which the set screw 85 is again set up.

In order to compensate for .the dierent angular positions of the cradle so as to bring the edge of the lens into proper working relation with the face of the grinding wheel, in some cases I mount the standard member so that it may slide back and forth on its bracket and secure the same in adjusted position by a screw 86, while in other cases a cam or eccentric member 87 may be mountgage any one of thethree notches 90 in the collar 96 whereby when the cradleis swung to the position shown in Figure l the cam is thrown to the position opposite to that illustrated in Figures 7 and 8 and when the cradle is thrown to the opposite angular position the cam is drawn to the position illustrated in Figures 7 and 8.

In mounting the lens 49 in the machine, I first place a series of dots 92 as illustrated in Figure 13 along the major axis of the lens to be ground, I then place this lens upon a. face plate 5() which is provided with peek holes 93 as best illustrated in Figure ll through which holes thespots on the lenses may be observed and when the lens isin proper position as determined by aligning, these spots with these peek holes the lens is bound by a hand clamp 94, see Figure 9, to the plate 50 and is subsequently positioned in the machine where it is bound by the clamp plate 5l, the pins 95 in the plate 50 serving to `insuire the accurate axial` positioning ofthe lens in the machine relatively to the pattern.

The hand clamp 9e is then removed and the work frame swung down into operative position placing the edge of the lens in contact with the lgrinding wheel.

The machine is now started, the grinding wheel rotated rapidly while the lens is rotated very slowly andas the grinder removes the surplus from t-he edge of the lens, the edge of the pattern 44E is forced `downwardly by the spring 66 into Contact with the roll l5 and the continued rotation of the pattern n and the lens causes the lens to be ground to the exact shape controlled by the pattern.

My improved lens edge lgrinding machine is simple andl practical in construction and effective in its operation and by its use the edges of the lens may be ground first to size in out-line and then to the angles of its V- shape bevel without being obliged to remove the lens from its holder, whereby one setting of the lens in its holder is suiicient for the performing of all three of the distinct grinding operations, or the lens may be beveled from the roughed out cutting and ground to size without first grinding it at substantially right angles to its face surface.

The foregoing description is directed solely towards the construction illustrated, but I desire it to be understood that I -reserve the privilege of resorting to all the mechanical changes to which the 4device is susceptible, the invention being defined and limited only by the terms of the appended claims.

I claim:

1. In a lens grinding machine having a grinding wheel, a frame, means tiltably mounted in the iframe for operatively sup- ')orting a lens, and means tor preventing the tiltably mounted means from being adjusted to different tilted positions While the lens is in operative proximity to the grinding Wheel.

2. An attachment 'for lens grinding machines in combination with a grinding wheel, consisting of a cradle supporting frame, a tiltably mounted cradle in the frame, means in the cradle for operatively supporting a lens, and means for preventing the cradle from being adjusted to different tilted positions Without removing it from its operating proximity to the grinding Wheel.

3. In a lens grinding machine, a forked cradle supporting trame, a cradle pivotally mounted in said trame carrying means for supporting the lens, a notched disk fixed to move with said cradle and a latch bolt normally in engagement with one of said notches to lock the cradle in different pivotally-adjusted positions, and means for preventing the unlocking action ot' the bolt until said frame has been raised a predetermined distance.

An attachment for lens grinding machines in combination with a grinding wheel consisting o1 means tor supporting the lens in proximity to the wheel, means for rotating the support with its lens, means Whereby said supporting means may be shifted to present the edge portion ot the lens at ditlierentangles to said Wheel, and means 'whereby the lens support must be shifted to remove the lens from contact with the Wheel during the shifting operation.

In an attachment for lens grinding machines, a frame, a cradle pivotally mounted in said trame, means ior operatively mounting a lens in said cradle, and adjustable means to move said cradle with relation to said frame transversely of the pivot oi' said cradle to center the lens with respect to its thickness on the axial line through the cradle pivots.

6.-In lens grinding machine, a trame, a cradle pivotally mounted in said frame, means in said cradle for operatively mounting a lens, yieldable means to move said cradle in one direction, and threaded means to move said cradle in the opposite direction with relation to the frame transversely of the pivot ot said cradle, whereby the lens may be centered with respect to its thickness on the pivotal axis of said cradle.

7. An attachment for lens grinding machines in combination With a grinding Wheel consisting ot a trame pivotally mountedy adjacent the Wheel, a head member longitudinally slidable in said trame, said head have ing Work-clamping mea-ns and a pattern member mounted thereon, a roll on said tor engaging the pattern member, means for rotating said Work clamp and pattern in unison, and means for adjusting said trame transversely of its pivots whereby it may be adjusted to be swung about an; axis passing through substantially the center of the lens to ditlerent positions to present dilllerent edge portions of the Work at angles at each side of a perpendicular to the grinding surface of the Wheel.

8. in attachment for lens grinding machines comprising a cradle-supporting means, a cradle pivotally mounted in said means, a head having lens-mounting means reciprocably mounted in said cradle, a pattern on said head, a roll on said cradle engaging said pattern, a spring carried by said'cradle causing continuous contact of said roller and pattern, means Jfor rot-ating said lens mounting and said pattern, means for adjusting said cradle transversely ot the pivots ot' said cradle whereby it may be adjusted to be swung about an axis passing through substantially the center of the lens to present the work at an angle at each side of a perpendicular to the grinding surface of the Wheel.

In testimony whereof I aliiX my signature.

HARRY T. DANIELS. 

